2007-06-12 19:18:45 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Wikipedia references several degree of hardness definitions. The most direct is the American, where 1 degree of hardness = 1 ppm:
"Various obsolete "degrees" (of hardness):
Clark degrees (°Clark)/English degrees (°E)
- conversion to mg/L calcium: divide by 0.175
One degree Clark corresponds to one grain of calcium carbonate in one Imperial gallon of water which is equivalent to 14.28 parts calcium carbonate in 1,000,000 parts water.
German degrees (°dH)
- conversion to mg/L calcium: divide by 0.14
One degree German corresponds to one part calcium oxide in 100,000 parts of water.
French degrees (°f) (shares symbol with degree Fahrenheit, but in lowercase)
- conversion to mg/L calcium: divide by 0.25
One degree French corresponds to one part calcium carbonate in 100,000 parts of water.
American degrees
One degree American corresponds to one part calcium carbonate in 1,000,000 parts water (1 mg/L or 1 ppm)
Degrees of general hardness (dGH)
One degree of general hardness corresponds to 10 mg of calcium oxide or magnesium oxide per litre of water "
2007-06-12 19:45:07 · answer #1 · answered by Helmut 7 · 1⤊ 0⤋
Water Hardness Conversion
2016-11-12 20:06:47 · answer #2 · answered by ? 4 · 0⤊ 0⤋
TRICKY ONE HEY
2016-03-19 03:10:39 · answer #3 · answered by ? 4 · 0⤊ 0⤋